We have four 8310 curve blackberry's and originally they were set up on BES 4.0 connecting to an Exchange 2000 server on SBS 2000. All was fine except that the calendars were not synchronizing.

Anyway, we have ben going through an upgrade. I installed a brand new 2003 Standard server and Exchange 2003. I set up a new BES server version 4.1 and went through the relevent security setup bits to allow BESAdmin access to the mailboxes.

I then proceeded to wipe the blackberry's and re-activate them with the new server. Everything looked fine, however, at least three of the four blackberry's have a problem sending, the fourth is unknown as the person is n holiday. When they send a message, it waits a second and then gives them a red cross. If they wait for a minute or so and try to send again, it works.

Two of the blackberry's are on software version 4.2.2.146 and two are on 4.5.0.55.